Journal
JOURNAL OF MATERIALS CHEMISTRY B
Volume 3, Issue 44, Pages 8684-8693Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tb01854d
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Funding
- Sino-German Center for Research Promotion [GZ899]
- National Natural Science Foundation of China [21273032, 81401458]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Shanghai Natural Science Foundation [14ZR1432400]
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We report a facile approach to form iron oxide nanoparticle (NP)-loaded gamma-polyglutamic acid (gamma-PGA) nanogels (NGs) for MR imaging of tumors. In this study, gamma-PGA with carboxyl groups activated by 1-ethyl-3-[3-dimethylaminopropyl] carbodiimide hydrochloride (EDC) in aqueous solution was firstly emulsified, followed by in situ chemical crosslinking with polyethyleneimine (PEI)-coated iron oxide NPs (PEI-Fe3O4 NPs) with a core size of 8.9 +/- 2.1 nm synthesized via a mild reduction route. The formed gamma-PGA NGs containing iron oxide NPs (gamma-PGA/PEI-Fe3O4 NGs) with a size of 152.3 +/- 13.1 nm are water-dispersible, colloidally stable, noncytotoxic in a given concentration range, and display a r(2) relaxivity of 171.1 mM(-1) s(-1). Likewise, the hybrid NGs can be taken up by cancer cells with the uptake of Fe significantly higher than single Fe3O4 NPs. These properties render the formed gamma-PGA/PEI-Fe3O4 NGs with an ability to be used as an effective contrast agent for MR imaging of cancer cells in vitro and the xenografted tumor model in vivo via the passive enhanced permeability and retention effect after intravenous injection. The developed gamma-PGA/PEI-Fe3O4 hybrid NGs may hold great promise to be used as a novel contrast agent for MR imaging or other theranostic applications.
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